The most common cause of sinkhole formation is _____.

Soil _____ is the slowest type of mass wasting and may cause bent tree trunks and leaning fences. It may also crack house foundations, driveways, and walls.

Which of these is NOT a greenhouse gas? _____

The water table is at the top of the _____ of groundwater.

The ____ in the earth’s core creates a magnetic field that deflects some solar radiation from the earth.  This solar deflection helps keep the earth at a comfortable temperature for life.

The water table is at the top of the _____ of groundwater.

The ____ in the earth’s core creates a magnetic field that deflects some solar radiation from the earth.  This solar deflection helps keep the earth at a comfortable temperature for life.

Most of the biggest volcanic eruptions and earthquakes in the world occur along the Ring of Fire around the edge of the _____ Ocean.

___ is the common carbonate mineral in sea shells and coral reefs, and may be at risk of dissolving due to ocean acidification. This is also the main mineral in limestone caves.

Many of the largest deserts in the world, like the Sahara Desert, are found at the _____.